// Copyright (c) 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_MESSAGE_CENTER_VIEWS_MESSAGE_LIST_VIEW_H_
#define UI_MESSAGE_CENTER_VIEWS_MESSAGE_LIST_VIEW_H_

#include <list>
#include <set>

#include "base/macros.h"
#include "ui/compositor/paint_context.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"
#include "ui/message_center/message_center_export.h"
#include "ui/message_center/notification.h"
#include "ui/views/animation/bounds_animator.h"
#include "ui/views/animation/bounds_animator_observer.h"
#include "ui/views/view.h"

namespace gfx {
class Canvas;
}

namespace ui {
class Layer;
}

namespace message_center {

class MessageCenterView;
class MessageView;

// Displays a list of messages for rich notifications. Functions as an array of
// MessageViews and animates them on transitions. It also supports
// repositioning.
class MessageListView : public views::View,
                        public views::BoundsAnimatorObserver {
public:
    explicit MessageListView(MessageCenterView* message_center_view,
        bool top_down);
    ~MessageListView() override;

    void AddNotificationAt(MessageView* view, int i);
    void RemoveNotification(MessageView* view);
    void UpdateNotification(MessageView* view, const Notification& notification);
    void SetRepositionTarget(const gfx::Rect& target_rect);
    void ResetRepositionSession();
    void ClearAllNotifications(const gfx::Rect& visible_scroll_rect);

    MESSAGE_CENTER_EXPORT void SetRepositionTargetForTest(
        const gfx::Rect& target_rect);

protected:
    // Overridden from views::View.
    void Layout() override;
    gfx::Size GetPreferredSize() const override;
    int GetHeightForWidth(int width) const override;
    void PaintChildren(const ui::PaintContext& context) override;
    void ReorderChildLayers(ui::Layer* parent_layer) override;

    // Overridden from views::BoundsAnimatorObserver.
    void OnBoundsAnimatorProgressed(views::BoundsAnimator* animator) override;
    void OnBoundsAnimatorDone(views::BoundsAnimator* animator) override;

private:
    friend class MessageCenterViewTest;

    bool IsValidChild(const views::View* child) const;
    void DoUpdateIfPossible();

    // Animates all notifications below target upwards to align with the top of
    // the last closed notification.
    void AnimateNotificationsBelowTarget();
    // Animates all notifications above target downwards to align with the top of
    // the last closed notification.
    void AnimateNotificationsAboveTarget();

    // Schedules animation for a child to the specified position. Returns false
    // if |child| will disappear after the animation.
    bool AnimateChild(views::View* child,
        int top,
        int height,
        bool animate_even_on_move);

    // Animate clearing one notification.
    void AnimateClearingOneNotification();
    MessageCenterView* message_center_view() const
    {
        return message_center_view_;
    }

    MessageCenterView* message_center_view_; // Weak reference.
    // The top position of the reposition target rectangle.
    int reposition_top_;
    int fixed_height_;
    bool has_deferred_task_;
    bool clear_all_started_;
    bool top_down_;
    std::set<views::View*> adding_views_;
    std::set<views::View*> deleting_views_;
    std::set<views::View*> deleted_when_done_;
    std::list<views::View*> clearing_all_views_;
    views::BoundsAnimator animator_;

    // If true, the message loop will be quitted after the animation finishes.
    // This is just for tests and has no setter.
    bool quit_message_loop_after_animation_for_test_;

    base::WeakPtrFactory<MessageListView> weak_ptr_factory_;
    DISALLOW_COPY_AND_ASSIGN(MessageListView);
};

} // namespace message_center
#endif // UI_MESSAGE_CENTER_VIEWS_MESSAGE_LIST_VIEW_H_
